x^2+x+1=0so x+1+1/x=0so x+1/x=-1so x^2+1/x^2+2=1so x^2+1/x^2=-1so x^4+1/x^4+2=1so x^4+1/x^4=-1
方程x^2+x+1=0无解,所以此题有问题